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After this, he said he plans to negotiate a massive new trade deal with the US to make up for some of the losses a standoff with the EU would bring.

Donald Trump has said he is keen on this, but Ms Pelosi has now thrown a spanner in the works for the US President.

She told the Irish Times in Washington yesterday that she will block a trade deal outside of the already agreed Withdrawal Agreement if it threatens to destabilise the Good Friday Agreement and peace in the North.

She said: “We made it clear in our conversations with senior members of the Conservative Party earlier this year that there should be no return to a hard border on the island.